Hi normchurch - I write for the leading jazz publications in the UK and the USA, and such is the reverence in which Miles is held in the jazz community, that it is almost mandatory, when interviewing any musician who worked with him, to tell stories about what he was like.
I have talked with half a dozen, and the consensus is that, as a musician, Miles was giving, helpful, encouraging, and keen to get the best out of everyone for his music. As a person … that's a slightly different story!
But genius is allowed to be a little difficult - just on the days with a 'y' in them!!!